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I checked adle and found that the compileSdkVersion and buildToolVersion versions were the same. At first, I suspected a problem with the sdk build tools version. out NfcCardRead-release-signed-aligned.apk NfcCardRead-release-unsigned-aligned.apkĮxception in thread "main" :Ĭom/android/apksigner/ApkSignerTool : Unsupported major.minor version 52.0Īt 1(Native Method)Īt (ClassLoader.java:800)Īt (SecureClassLoader.java:142)Īt (URLClassLoader.java:449)Īt $100(URLClassLoader.java:71)Īt $1.run(URLClassLoader.java:361)Īt $1.run(URLClassLoader.java:355)Īt (Native Method)Īt (URLClassLoader.java:354)Īt (ClassLoader.java:425)Īt $AppClassLoader.loadClass(Launcher.java:308)Īt (ClassLoader.java:358)Īt (LauncherHelper.java:482)įrom the above output, we can see that the apksigner command comes from SDK v25.0.3. This occur due to incompatible java version you are using in android studio and the java version that was used with your imported project. Sign -ks/usr/lib/jvm/java-8-openjdk-amd64/bin/bbb_aosp.jks/ The project was built on 1.8 ( 52.0 - refer this link How to fix : Unsupported major.minor version).